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Wump World by Bill Peet In time the murky skies would clear up and the rains would wash the scum from the rivers and lakes. The tall buildings would come tumbling down and the freeways would crumble away. And in time the green growth would wind its way up through the rubble.But the Wump World would never be quite the same. In time the murky skies would clear up and the rains would wash the scum from the rivers and lakes. The tall buildings would come tumbling down and the freeways would crumble away. And in time the green growth would wind its way up through the rubble.But the Wump World would never be quite the same. In time the murky skies would clear up and the rains would wash the scum from the rivers and lakes. The tall buildings would come tumbling down and the freeways would crumble away. And in time the green growth would wind its way up through the rubble.But the Wump World would never be quite the same. In time the murky skies would clear up and the rains would wash the scum from the rivers and lakes. The tall buildings would come tumbling down and the freeways would crumble away. And in time the green growth would wind its way up through the rubble.But the Wump World would never be quite the same. In time the murky skies would clear up and the rains would wash the scum from the rivers and lakes. The tall buildings would come tumbling down and the freeways would crumble away. And in time the green growth would wind its way up through the rubble. But the Wump World would never be quite the same.

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Possible Exam Questions from Previous Week 1.List and explain the four premises of evolution by natural selection as proposed by Charles Darwin. 2.Relate the concepts of niche, competitive exclusion, and resource partitioning. 3.What are the differences between primary and secondary succession?

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Possible Exam Questions from This Week 1.Draw a biogeochemical cycle (e.g., carbon cycle or nitrogen cycle). 2.Diagram the general global patterns of air circulation and precipitation. Discuss the process by which these patterns arise. 3.Describe how humans have altered the nitrogen cycle. Describe how these alterations directly affect the environment and indirectly effect the environment through the carbon cycle.

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Biogeochemical Cycles Biogeochemical cycles describe the ecosystem by the transfer of elements through the system. By examining the cycles we can look at the fluxes of nutrients (sources and sinks) and better understand human-caused imbalances.

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Light Ultraviolet lightis absorbed by ozone. Ultraviolet light is absorbed by ozone. Visible lightpasses through atmosphere, then it is absorbed by earth and water, re-radiated as direct heat or infrared light(which also may be absorbed by CO 2, CH 4, or H 2 O to produce heat) Visible light passes through atmosphere, then it is absorbed by earth and water, re-radiated as direct heat or infrared light (which also may be absorbed by CO 2, CH 4, or H 2 O to produce heat) which contributes to the greenhouse effect.

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Conclusions In contrast to energy, which moves in one direction through the ecosystem, materials are continually recycled from the abiotic environment to organisms, and back to the abiotic environment. Changes in one of the biogeochemical cycles usually influences the other biogeochemical cycles.